A phase compensation method and system based on multi-element channel selection

Abstract

The invention provides a phase compensation method based on multi-array element channel selection. The method comprises the following steps: setting a corresponding and independent tracking channel for each antenna array element, wherein the tracking channel locks electromagnetic wave signals received by the corresponding antenna array element, and all antenna array elements receive the same electromagnetic wave beam signal; when at least more than two tracking channels receive the electromagnetic wave beam signal, locking channel output signal intensity and a carrier phase NCO value of the tracking channels; monitoring the channel identity of the locked tracking channels in real time, and when the channel identity of a certain tracking channel is greater than the signal intensity of the currently used antenna array element, switching the antenna array element; extracting the carrier phase NCO value in real time, and calculating a carrier phase difference of the two; and compensating the carrier phase difference in a down-conversion DCC module, and the switch is completed. According to the phase compensation method provided by the invention, the continuity of carrier phases in an antenna array element switching process is kept.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a phase compensation method and system based on multi-element channel selection. Background technique [0002] The satellite communication system consists of three parts: the satellite terminal, the ground terminal, and the user terminal. The satellite terminal acts as a relay station in the air, that is, it amplifies the electromagnetic waves sent by the ground station and then sends them back to another ground station. The satellite body includes two subsystems: the on-board equipment and the satellite parent body. The ground station is the interface between the satellite system and the ground public network. Ground users can also enter and exit the satellite system through the ground station to form a link. The ground station also includes the ground satellite control center, and its tracking, telemetry and command stations. The user terminal refers to various user term...

AI Technical Summary

Problems solved by technology

The signal of the array element facing the incoming wave direction is stronger. If the signal receiver using this array element can receive the signal normally, but when the antenna rotates so that the array element faces away from the incoming wave direction, the signal strength will decrease, resulting in The receiver loses lock; at the same time, even if the signals in all directions are strong enough, direct channel switching will cause the phase of the signal connected to the DDC (Digital Down Converter) down-conversion module to be discontinuous, especially because the carrier cycle is short, the downstream The carrier loop of the receiver has high requirements on the phase continuity of the carrier. Switching the array element causes the carrier phase to be discontinuous, which may cause the carrier loop of the downstream receiver tracking loop to lose lock.

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